Fix/improve various dosctrings

[AdeelH]

Overview

This PR fixes/improves various dosctrings throughout the code base. Most of the fixes are for the formatting of the return value description.

Checklist

• Added needs-backport label if PR is bug fix that applies to previous minor release
• Ran scripts/format_code and committed any changes
• Documentation updated if needed
• PR has a name that won't get you publicly shamed for vagueness

Notes

N/A

Testing Instructions

• See CI docs build.

[codecov]

Codecov Report

Merging #1903 (4b1192e) into master (0ebb906) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 4b1192e differs from pull request most recent head 7a0edbb. Consider uploading reports for the commit 7a0edbb to get more accurate results

@@           Coverage Diff           @@
##           master    #1903   +/-   ##
=======================================
  Coverage   81.56%   81.56%           
=======================================
  Files         190      190           
  Lines        9282     9282           
=======================================
  Hits         7571     7571           
  Misses       1711     1711           

Files Changed	Coverage Δ
rastervision_core/rastervision/core/box.py	100.00% <ø> (ø)
...vision_core/rastervision/core/data/label/labels.py	100.00% <ø> (ø)
...on/core/data/label/semantic_segmentation_labels.py	91.53% <ø> (ø)
...astervision/core/data/label_source/label_source.py	75.00% <ø> (ø)
...data/label_source/object_detection_label_source.py	83.63% <ø> (ø)
...vision_core/rastervision/core/data/utils/raster.py	97.05% <ø> (ø)
...ision/core/evaluation/classification_evaluation.py	96.87% <ø> (ø)
...vision_core/rastervision/core/rv_pipeline/utils.py	100.00% <ø> (ø)
rastervision_core/rastervision/core/utils/stac.py	70.58% <ø> (ø)
...tervision_pipeline/rastervision/pipeline/config.py	79.59% <ø> (ø)
... and 6 more

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